HAA Mautby is remains of a World War Two heavy anti aircraft battery. This site, known as YH4, was one of a group of heavy anti aircraft (HAA) batteries positioned to protect Great Yarmouth. (My home town) Most of this has been knocked down but there is still a few remains. Apprently it had a control center for other guns along the coast and may have had an airstrip for light aircrafts.
Here is a few pics I took when I went there last month.....
I will go to more abandoned places in the future and get some pictures, this was the first time I did anything like this and found it quite fun to do.